1 files changed, 87 insertions, 0 deletions
diff --git a/tests/ui/dep-graph/dep-graph-struct-signature.rs b/tests/ui/dep-graph/dep-graph-struct-signature.rs
new file mode 100644
index 00000000000..fcf9f638710
--- /dev/null
+++ b/tests/ui/dep-graph/dep-graph-struct-signature.rs
@@ -0,0 +1,87 @@
+// Test cases where a changing struct appears in the signature of fns
+// and methods.
+
+// incremental
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+fn main() { }
+
+#[rustc_if_this_changed]
+struct WillChange {
+    x: u32,
+    y: u32
+}
+
+struct WontChange {
+    x: u32,
+    y: u32
+}
+
+// these are valid dependencies
+mod signatures {
+    use WillChange;
+
+    #[rustc_then_this_would_need(type_of)] //~ ERROR no path
+    #[rustc_then_this_would_need(associated_item)] //~ ERROR no path
+    #[rustc_then_this_would_need(trait_def)] //~ ERROR no path
+    trait Bar {
+        #[rustc_then_this_would_need(fn_sig)] //~ ERROR OK
+        fn do_something(x: WillChange);
+    }
+
+    #[rustc_then_this_would_need(fn_sig)] //~ ERROR OK
+    #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+    fn some_fn(x: WillChange) { }
+
+    #[rustc_then_this_would_need(fn_sig)] //~ ERROR OK
+    #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+    fn new_foo(x: u32, y: u32) -> WillChange {
+        WillChange { x: x, y: y }
+    }
+
+    #[rustc_then_this_would_need(type_of)] //~ ERROR OK
+    impl WillChange {
+        #[rustc_then_this_would_need(fn_sig)] //~ ERROR OK
+        #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+        fn new(x: u32, y: u32) -> WillChange { loop { } }
+    }
+
+    #[rustc_then_this_would_need(type_of)] //~ ERROR OK
+    impl WillChange {
+        #[rustc_then_this_would_need(fn_sig)] //~ ERROR OK
+        #[rustc_then_this_would_need(typeck)] //~ ERROR OK
+        fn method(&self, x: u32) { }
+    }
+
+    struct WillChanges {
+        #[rustc_then_this_would_need(type_of)] //~ ERROR OK
+        x: WillChange,
+        #[rustc_then_this_would_need(type_of)] //~ ERROR OK
+        y: WillChange
+    }
+
+    // The fields change, not the type itself.
+    #[rustc_then_this_would_need(type_of)] //~ ERROR no path
+    fn indirect(x: WillChanges) { }
+}
+
+mod invalid_signatures {
+    use WontChange;
+
+    #[rustc_then_this_would_need(type_of)] //~ ERROR no path
+    trait A {
+        #[rustc_then_this_would_need(fn_sig)] //~ ERROR no path
+        fn do_something_else_twice(x: WontChange);
+    }
+
+    #[rustc_then_this_would_need(fn_sig)] //~ ERROR no path
+    fn b(x: WontChange) { }
+
+    #[rustc_then_this_would_need(fn_sig)] //~ ERROR no path from `WillChange`
+    #[rustc_then_this_would_need(typeck)] //~ ERROR no path from `WillChange`
+    fn c(x: u32) { }
+}